When a process create a new process using fork operating what state is shared between the parent process and child processstackheap and shared memory segment?

When a process creates a new process using fork, the parent and child processes share the same memory space in terms of the stack and heap, but they each get their own separate copies of these areas. The stack and heap are duplicated for the child process, meaning changes in one do not affect the other. However, any shared memory segments that were explicitly set up before the fork are accessible to both processes, allowing them to communicate or share data.